[Yan, Canqun] Univ South China, Affiliated Hosp 2, Dept Hlth Management Ctr, Hengyang Med Sch, Hengyang 421009, Peoples R China.
[Liu, Ying; Yang, F; Massey, Isaac Yaw; Yang, Fei] Univ South China, Sch Publ Hlth, Hengyang Med Sch, Hunan Prov Key Lab Typ Environm Pollut & Hlth Haza, Hengyang 421009, Peoples R China.
[Yang, F; Al Osman, Muwaffak; Yang, Fei; Yang, Yue] Cent South Univ, Xiangya Sch Publ Hlth, Hunan Prov Key Lab Clin Epidemiol, Changsha 410017, Peoples R China.
[Cao, Linghui] Changsha Cent Hosp, Changsha 410004, Peoples R China.
[Yang, F; Yang, Fei] Univ South China, Sch Basic Med Sci, Hengyang Med Sch, Lab Ecol Environm & Crit Human Dis Prevent Hunan P, Hengyang 421009, Peoples R China.